Electrical transformer.



PATENTED JUNE 9, 1908.

v No. 889,981

S. E. JOHANNESEN. ELECTRICAL TRANSFORMER.

APPLICATION TILED MAR.S,190G.

NITED sTA'rns PATENT curios.

svEND E. uonANNEsEN, oi-i PITTSBURG, PENNSYLVANIA, ASSIGNOR TO wrisrniesouss ELECTRIC & MANUFACTURING ooMPANY, A conroaATroN or PENNSYLVANIA.

ELECTRICAL TRANSFQRMEE.

Specification of Letters Patent.

Application filed March 3, 1906. Serial 1%. 304,114.

a hill whom it may concern: .Be it known that I, SvnNn E. JoHAN- NESEN, a citizen of the United States, and a y 4 resident of Pittsburg, in the county of Alle glreny and State of Pennsylvania, have invented a new and useful Improvement in 5 Electrical Transformers, of winch the follow ,ingxjlis a specification.

y invention relates to. electrical transformers and particularly to those which are known as auto transformers.

in voltage regulationsare generally of the type known asiiuto-tfansformers and their windings are-usually sub-divided by means, of lea'dsto which; circuit connections may be made. In orderithavthe voltages of such transformers may be adjusted to suit given conditions they are frequently provided with leads, or other means are provided, whereby the point of connection of the supply circuit therewith may be varied.

When a transformer comprises a plurality of coils that are so arranged as to secure sym-.

metrical conditions as regards magnetic leakage, the symmetry 'of the conditionsmay be disturbed by connecting the supply circuit to other points than the terminals, and it is theecific object of my invention to so arrange s t e coils and the circuits thereof that the voltage of 'thetransformer may be varied without disturbing the symmetry of conditions as regards leakage, the reactance of-the transformer being also maintained approximately constant of-varied only between. very narrow limits, with variations in the voltage.

Figure 1 of the accompanying drawing is a diagrammatic view ofa transformer that is constructed and arranged in accordance with my invention and 2is a simplified diagram of the transformer shown in Fig. 1.

transformer 1, comprises a set of .soils 2, 3, 4 and 5 that are arranged in series relation with one terminal 6 connected'to a supply conductor 7 and another set of coils 8,9, G

and ll that are argranged in parallel selation with one terminal connected to supply condoctor 12, the members of the two sets being symmetrically arranged, with reference to each other in order that the leakage and reactance of the transformer may be ver small. Each of the coils 8, 9, 10 and 111s i A 'lTlL-f 51 l r v e A li'atented Stine 9, NW8.

similarly sub-divided by means of loads 13-,

1e and 15, and the points'ot' sub division of the coils are connected together and to sta tionary contact terminals 15, 17 and 18, re-

spe'ctively, the terminals er the coils 8, 9, l0

and 1] bein connected to stationar' contact terminals 19 and 20. A movable switch arm 21 may be employed as a suitable means for connecting one terminal of a motor orother translating device 22. to each or any'of the stationary contact terminals 16 to 20, in-

elusive, and for thereby regulatingthe'vol ta e applied to the motor. I

n order to vary the voltage of the transformer to suit any given condition, such as that of a su ply circuit that may comprise a 5 trolley conductor 23 and atrack rail 24, as indicated in Fig. 2, terminal 25 of the set of coils .2, 3, 4 and 5, is adapted to be connected to the terminals or. to the points oi sub-divi sions of the coils 8, 9, l0 and 11, 'lleans may be provided whereby adjustment of the connection may be efiected at any time as may become desirable in a railway system, for in stance, where the voltage 0: the sup ly cirtions, or the connection may be made per manently durin the construction of the transformer, as desired. When the coils and. the circuits thereof are arranged in a manner similar to what has been shown and described, the symmetry of conditions, as etfooting the leakage in the transformer, will notbe disturbed by variations in the total cuit decreases as the distances from t e stag5 voltage of the transformer or in the voltage Q applied to an external circuit, and-the reactance of the transformerwill remain substantially constant during voltage adjust.-

ments or will vary through only a limited range. The taps whereby the coils 8, 9, 10 and ,11 are sub-divided thus serve both as means whereby the voltage of an external circuit may be varied and as means-whereby the iotal voltage oithe transformer may be ad'ulsted.

lhe coils 2,3, 4 and connected otherwise tr' the nui'nber and arranges olthe coils and of the sire oi-the nier maybe va ried in 0 then respects without departhigiroin my invention.

a as shown, and

and 5 may be arranged I I claim as my invention:

1. A transformer comprising a set of parallel-connected coils and another set of coils havingone terminal connected to corresponding points of the parallel-connected coils, the members of the two sets of coils being alternately disposed with reference to each other.

p 2. The combination with a transformer comprising two sets of coils, the members of the respective sets being arranged alternately with reference to each other and those of one set'being connected in parallel relation, of

'means for connecting oneterminal of the other set of coils to corresponding points of the parallel-connected coils.

3. The combination with a transformer -'comprising two sets of coils, the members of the respective sets being arranged alternately" with reference to each other and those of one set being connected in parallel relation, of

means for connecting one terminal. of the .ing subdivisions of all of the coils of the other set. 4 r

5. The combination with. an electrical supply circuit and a translating device, of a transformer comprising a set of coils having their corresponding terminals and a plurality ssaesi nal ada ted for connection to corresponding end an intermediate points in the coils of the other set, and means for making adjustable connection between the translating device and the parallel-connected coils.

'6. The comb nation with a supply circuit and a translating device, of a transformer comprising a set of parallcl-connected coils having intermediate taps or leads and another set of coils having one of its terminals connected to the su ply circuit and its other terminal ada ted or connection to corres onlling en and intermediate leadsifrom t e parallel-connected coils; the coils ofthe two sets beingsyminetricall disposed, and a switch device for making a justable connection between the translating device and the transformer leads.

7. A transformer comprising a set of sub divided coils and another set of coils one'terminal of which may be connected to the points of sub-division of the first set.

8. A transformer having a two part wind in one of which is sub-divided and one terminal of the other part of which is connected to the points of sub-division of the first part. y

SVEND ETJOHANNESEN.

. Witnesses:

Orro S. SoHArRnn, BIRNEY Hmns. 

